TWI784749B - Projection screen - Google Patents

Abstract

A projection screen including a substrate, a lower surface layer, an intermediate layer, and an upper surface layer is provided. The lower surface layer is located on the substrate. A material of the lower surface layer includes an acrylate, a color paste or a carbon black, and a first-type particle. The intermediate layer is located on the substrate. A material of the intermediate layer includes an acrylate, and a second-type particle. The upper surface layer is located on the substrate. A material of the upper surface layer includes an acrylate, and a third-type particle. The lower surface layer, the intermediate layer and the upper surface layer are sequentially stacked on the substrate. Materials included in the first-type particle, the second-type particle and the third-type particle do not overlay with each other.

Description

Projection Screen

The present invention relates to a projection screen, and in particular to a projection screen capable of suppressing the spot phenomenon of a laser projector.

There are many types of digital light source projectors on the market now, some use white light bulbs to assist projection with a color wheel, and some use three-color light-emitting diodes to project. But the light source itself usually diverges so that the intensity cannot be concentrated on the projection screen.

The laser light source has the advantages of high purity, high power lighting, and high color saturation. At this stage, many manufacturers use lasers instead of light-emitting diodes as projection light sources. However, due to the coherent interference of the laser light source, when the laser projector projects an image on the projection screen, the image on the projection screen can clearly detect the laser spot, resulting in a decrease in image quality.

The "Prior Art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "Prior Art" paragraph may contain some conventional technologies that do not constitute the knowledge of those with ordinary skill in the art. The content disclosed in the "Prior Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been understood by those with ordinary knowledge in the technical field before the application of the present invention know or know.

The invention provides a projection screen, which can effectively suppress the laser spot problem.

An embodiment of the present invention provides a projection screen, which includes a base material, a lower surface layer, an intermediate layer, and an upper surface layer. The lower skin is on the substrate. The material of the lower surface layer includes acrylate, color paste or carbon black, and type I particles. The interposer is on the substrate. The material of the intermediate layer includes acrylic ester and second-type particles. The upper surface layer is on the substrate. The material of the upper surface layer includes acrylic and type III particles. The lower surface layer, the intermediate layer and the upper surface layer are sequentially stacked on the substrate. The materials contained in the first-type particles, the second-type particles and the third-type particles do not overlap with each other.

In an embodiment of the present invention, the above-mentioned first type particles include first particles and second particles. The first particle and the second particle are silicone, polymethyl methacrylate, poly-n-butyl methyl methacrylate, polystyrene, silicon dioxide, calcium carbonate, hollow glass beads, aluminum oxide, potassium titanate, barium sulfate , titanium dioxide, porous ore and zirconia.

In an embodiment of the present invention, among the materials of the above-mentioned lower surface layer, the densities of acrylate, colorant or carbon black, first particles, and second particles fall within the range of 45 to 60 g/cm ³ , and 0.3 to 1 g/cm 3 , respectively. cm ³ , 6 to 15 g/cm ³ , and 9 to 24 g/cm ³ .

In an embodiment of the present invention, in the material of the above-mentioned lower surface layer, the particle diameters of the color paste or carbon black, the first particle, and the second particle are respectively within the range of 0.02 to 0.1 micron, In the range of 1 to 4 microns, 2 to 5 microns.

In an embodiment of the present invention, among the above-mentioned materials of the lower surface layer, the refractive indices of the acrylic ester, the first particles, and the second particles fall within the ranges of 1.47-1.54, 1.55-1.61, and 1.43-1.49, respectively.

In an embodiment of the present invention, the above-mentioned second type particles include third particles, fourth particles and fifth particles. The third particle, the fourth particle and the fifth particle are silicone, polymethyl methacrylate, poly-n-butyl methyl methacrylate, polystyrene, silicon dioxide, calcium carbonate, hollow glass beads, alumina, titanic acid Three of potassium, barium sulfate, titanium dioxide, porous ore, zirconia and carbon black.

In an embodiment of the present invention, among the materials of the above intermediary layer, the densities of the acrylate, the third particle, the fourth particle, and the fifth particle fall within 50 to 58 g/cm ³ , and 13 to 18 g/cm ³ respectively , 10 to 15g/cm ³ , 4 to 9g/cm ³ in the range.

In an embodiment of the present invention, among the materials of the above-mentioned intermediary layer, the particle diameters of the third particle, the fourth particle, and the fifth particle fall within the range of 1 to 3 microns, 5 to 9 microns, and 8 to 12 microns, respectively. within range.

In an embodiment of the present invention, among the materials of the above intermediary layer, the refractive indices of acrylate, the third particle, the fourth particle, and the fifth particle fall in the range of 1.47 to 1.54, 1.54 to 1.60, 1.49 to 1.55, 1.43 to 1.45 range.

In an embodiment of the present invention, the above-mentioned fifth particle is a porous material, and has the largest particle size among the materials included in the lower surface layer, the intermediate layer, and the upper surface layer.

In one embodiment of the present invention, the material of the above-mentioned second type particles includes The material is porous and has the largest particle size among the materials included in the lower surface layer, the intermediate layer, and the upper surface layer.

In an embodiment of the present invention, the above-mentioned third type particles include sixth particles and seventh particles. The sixth particle and the seventh particle are silicone, polymethyl methacrylate, poly-n-butyl methyl methacrylate, polystyrene, silicon dioxide, calcium carbonate, hollow glass beads, aluminum oxide, potassium titanate, barium sulfate , titanium dioxide, porous ore, zirconia and carbon black.

In an embodiment of the present invention, among the materials of the above-mentioned upper surface layer, the densities of the acrylic ester, the sixth particle, and the seventh particle fall in the range of 55 to 65 g/cm ³ , 6 to 15 g/cm ³ , and 14 to 20 g, respectively. /cm ³ range.

In an embodiment of the present invention, in the above-mentioned material of the upper surface layer, the particle diameters of the sixth particle and the seventh particle fall within the ranges of 4-8 microns and 6-12 microns, respectively.

In an embodiment of the present invention, among the materials of the above-mentioned upper surface layer, the refractive indices of the acrylic ester, the sixth particles, and the seventh particles fall within the ranges of 1.51-1.60, 1.49-1.55, and 1.57-1.61, respectively.

In an embodiment of the present invention, the above-mentioned substrate has a plurality of microstructures on the surface facing the lower surface layer.

Based on the above, in one embodiment of the present invention, due to the selection of materials for each film layer of the projection screen and the ratio of the components of the materials, it is required that the materials included in the first type particles, the second type particles and the third type particles Repeat each other, so that when the incident light enters the projection screen, the refraction and diffusion of light occur, so when the incident light enters the surface, it destroys the The original coherence of the incident light (laser light) can effectively suppress the problem of laser spot

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

10:Projection screen

100: Substrate

110: Microstructure

200: lower surface layer

210, 310, 410: Acrylic

220: Type I Particles

221: The first particle

222: second particle

230: Color paste or carbon black

300: intermediary layer

320: Type 2 Particles

321: The third particle

322: The fourth particle

323: fifth particle

400: upper surface layer

420: Type III Particles

421: The sixth particle

422: seventh particle

L: incident light

FIG. 1A is a schematic diagram of a projection screen according to an embodiment of the present invention.

FIG. 1B is a schematic side view of the projection screen shown in FIG. 1A .

FIG. 2 is a schematic diagram of a lower surface layer in a projection screen according to another embodiment of the present invention.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

FIG. 1A is a schematic diagram of a projection screen according to an embodiment of the present invention. FIG. 1B is a schematic side view of the projection screen shown in FIG. 1A . Please refer to FIG. 1A and FIG. 1B , an embodiment of the present invention provides a projection screen 10 , which includes a substrate 100 , a lower surface layer 200 , an intermediate layer 300 and an upper surface layer 400 . The substrate 100 is, for example, a plastic substrate, a glass substrate, a curtain, a light-transmitting diffuser, or other suitable substrates. Lower surface layer 200, intermediary layer Both 300 and the upper surface layer 400 are located on the substrate 100 . Wherein, the lower surface layer 200 , the intermediate layer 300 and the upper surface layer 400 are sequentially stacked on the substrate 100 . The upper surface layer 400 is defined as the layer that the incident light L contacts first among the film layers of the projection screen 10 .

In this embodiment, the lower surface layer 200 is used to improve the contrast of the projected image, so it is preferable to select a material that can improve the contrast, and the selected material is related to the material of the substrate 100 . The intermediary layer 300 is used to destroy the coherence of the incident light L, and is preferably made of various materials or materials with different particle sizes and refractive indices. The upper surface layer 400 is used to improve the diffusivity, thus improving the half viewing angle.

In this embodiment, the material of the lower surface layer 200 includes acrylate 210, first-type particles 220, and color paste or carbon black 230, wherein the first-type particles 220 and color paste or carbon black 230 are mixed in acrylate 210 . The material of the intermediary layer 300 includes acrylate 310 and second-type particles 320 , wherein the second-type particles 320 are mixed in the acrylate 310 . The material of the upper surface layer 400 includes acrylate 410 and the third type particles 420 , wherein the third type particles 420 are mixed in the acrylate 410 . Wherein, the materials included in the first type particles 230 , the second type particles 320 and the third type particles 420 are not mutually overlapping. That is, the types of materials selected by the first-type particles 220 are different from the types of materials selected by the second-type particles 320 and the third-type particles 420. Similarly, the types of materials selected by the second-type particles 320 are different. Different from the material types selected by the first type particles 220 and the third type particles 420, and the material types selected by the third type particles 420 are different from those selected by the first type particles 220 and the second type particles 320 Material type. The materials of the acrylic ester 210 of the lower surface layer 200, the acrylic ester 310 of the intermediary layer 300, and the acrylic ester 410 of the upper surface layer 400 are similar The same, but because each layer is prepared separately, so the content of acrylate 210, acrylate 310 and acrylate 410 in each layer is different, but not limited thereto. In one embodiment, the content of the acrylate 210 , the acrylate 310 and the acrylate 410 in each layer may be the same.

In this embodiment, the first type particles 220 include first particles 221 and second particles 222 . The first particle 221 and the second particle 222 are silicone (silicone), polymethylmethacrylate (Polymethylmethacrylate, PMMA), polyn-butylmethylmethacrylate (PBMA), polystyrene (polystyrene, PS), dioxide Silicon (SiO2), calcium carbonate (CaCO3), hollow glass beads, aluminum oxide (Al2O3), potassium titanate (potassium titanate), barium sulfate (barium sulfate), titanium dioxide (TiO2), porous ores and zirconia (zirconia) the second of them. That is, the materials selected for the first particle 221 and the second particle 222 are two of the above-mentioned materials, and the material of the first particle 221 is different from the material of the second particle 222 .

In this embodiment, among the materials of the lower surface layer 200, the densities of the acrylic ester 210, the color paste or carbon black 230, the first particles 221, and the second particles 222 fall within the range of 45 to 60 g/cm ³ , and 0.3 to 1 g/cm 3 , respectively. ³ , in the range of 6 to 15 g/cm ³ , 9 to 24 g/cm ³ .

In this embodiment, in the material of the lower surface layer 200, the particle diameters of the color paste or carbon black 230, the first particle 221, and the second particle 222 respectively fall within the range of 0.02 to 0.1 microns, 1 to 4 microns, and 2 to 5 microns. within range.

In this embodiment, among the materials of the lower surface layer 200, the refractive indices of the acrylate 210, the first particles 221, and the second particles 222 fall in the range of 1.47 to 1.54, and 1.55, respectively. to 1.61, 1.43 to 1.49 ranges.

In this embodiment, the second type particles 320 include third particles 321 , fourth particles 322 and fifth particles 323 . The third particle 321, the fourth particle 322 and the fifth particle 323 are silicone, polymethyl methacrylate, poly-n-butyl methyl methacrylate, polystyrene, silicon dioxide, calcium carbonate, hollow glass beads, alumina , potassium titanate, barium sulfate, titanium dioxide, porous ore, zirconia and carbon black. That is, the materials selected by the third particle 321, the fourth particle 322, and the fifth particle 323 are three of the above-mentioned materials, and the materials selected by the third particle 321, the fourth particle 322, and the fifth particle 323 are The materials are all different. Among them, the materials selected for the third particle 321, the fourth particle 322 and the fifth particle 323 of the second type particle 320 are different from the materials selected for the first particle 221 and the second particle 222 of the first type particle 220. .

In this embodiment, among the materials of the intermediary layer 300, the densities of the acrylate 310, the third particle 321, the fourth particle 322, and the fifth particle 323 fall in the range of 50 to 58 g/cm ³ , and 13 to 18 g/cm ³ , respectively. , 10 to 15g/cm ³ , 4 to 9g/cm ³ in the range.

In this embodiment, among the materials of the interposer 300, the particle diameters of the third particles 321, the fourth particles 322, and the fifth particles 323 fall within the ranges of 1 to 3 microns, 5 to 9 microns, and 8 to 12 microns, respectively. Inside.

In this embodiment, among the materials of the interposer 300, the refractive indices of the acrylate 310, the third particle 321, the fourth particle 322, and the fifth particle 323 fall within the range of 1.47 to 1.54, 1.54 to 1.60, 1.49 to 1.55, 1.43 to 1.45 range.

In this embodiment, the material of the second type particle 320 includes a porous material, And among the materials included in the lower surface layer 200 , the intermediary layer 300 and the upper surface layer 400 , it has the largest particle size. For example, the fifth particle 323 is a porous material with the largest particle size among the materials included in the lower surface layer 200 , the intermediate layer 300 and the upper surface layer 400 . Wherein, the fifth particle 323 is selected as a porous material, and its surface properties are helpful to improve the coherence of destroying the incident light L.

In this embodiment, the third type particles 420 include sixth particles 421 and seventh particles 422 . The sixth particle 421 and the seventh particle 422 are silicone, polymethyl methacrylate, poly-n-butyl methyl methacrylate, polystyrene, silicon dioxide, calcium carbonate, hollow glass beads, aluminum oxide, potassium titanate, Two of barium sulfate, titanium dioxide, porous ore, zirconia and carbon black. That is, the materials selected for the sixth particle 421 and the seventh particle 422 are two of the above materials respectively, and the material of the sixth particle 421 is different from the material of the seventh particle 422 . Among them, the materials selected by the sixth particles 421 and the seventh particles 422 of the third type particles 420 are different from the materials selected by the first particles 221 and the second particles 222 of the first type particles 220 and the second type particles. 320 is the material selected for the third particle 321 , the fourth particle 322 and the fifth particle 323 .

In this embodiment, among the materials of the upper surface layer 400, the densities of the acrylate 410, the sixth particle 421, and the seventh particle 422 fall in the range of 55 to 65 g/cm ³ , 6 to 15 g/cm ³ , and 14. to 20 g/cm 3 , respectively. /cm ³ range.

In this embodiment, among the materials of the upper surface layer 400 , the particle diameters of the sixth particles 421 and the seventh particles 422 fall within the ranges of 4 to 8 microns and 6 to 12 microns, respectively.

In this embodiment, among the materials of the upper surface layer 400, acrylate 410, The refractive indices of the sixth particle 421 and the seventh particle 422 fall within the ranges of 1.51 to 1.60, 1.49 to 1.55, and 1.57 to 1.61, respectively.

FIG. 2 is a schematic diagram of a lower surface layer in a projection screen according to another embodiment of the present invention. Please refer to FIG. 1 and FIG. 2 , in this embodiment, the substrate 100 has a plurality of microstructures 110 on the surface facing the lower surface layer 200 . Wherein, the microstructure 110 may be a columnar microstructure, but the present invention is not limited thereto. In this embodiment, the above-mentioned lower surface layer 200 , intermediary layer 300 and upper surface layer 400 are sequentially stacked on the surface of the substrate 100 having the microstructure 110 . When the surface of the substrate 100 has the microstructure 110 , it helps to reduce the spot contrast of the incident light L, for example, making the spot contrast less than 10%.

To sum up, in one embodiment of the present invention, due to the selection of materials for each film layer of the projection screen and the ratio of each component of the material, it is required that the first type particles 220, the second type particles 320 and the third type particles 420 The included materials do not overlap with each other, so that when the incident light enters the projection screen, light refraction and diffusion occur, so when the incident light enters the surface, the original coherence of the incident light (laser light) is destroyed, and the laser light is effectively suppressed Spot problem.

Specifically, the projection screen of the embodiment of the present invention can obtain the following effects and advantages:

1. As shown in Table 1 below, in addition to effectively suppressing the laser spot phenomenon, the projection screen of the embodiment of the present invention still maintains the original surface brightness with a high transmittance.

2. Compared with various projection screens on the market, the projection screen of the embodiment of the present invention can maintain the original hue, and will not cause color deviation due to the coating.

3. As shown in Table 2 below, before the film layer is set, the original half viewing angle luminance of the projection screen (the viewing angle when the luminance is half of the luminance in the positive direction of 0 degrees) falls at 70 degrees. However, the luminance of the projection screen according to the embodiment of the present invention is still higher than the original half-view luminance of the projection screen without the film layer at a viewing angle of 80 degrees.

Four, after setting each film layer, the light spot contrast value of the projection screen of the embodiment of the present invention is 5.1% on the white screen, 9.8% on the red screen, 6.8% on the green screen, and 7.7% on the blue screen, showing The spot contrast value of each monochrome is less than 10%. Wherein, the light spot contrast value is defined as Cs=σ/I, σ is the standard deviation (standard deviation) of the image intensity (gray scale), and I is the mean value (mean) of the image intensity (gray scale).

5. With three-color laser projection, before the film layer is installed, the spot contrast value of the projection screen is 15.87%; while in the projection screen of the embodiment of the present invention, the spot contrast value is 8%, and the display spot contrast value drops by about 50% %, effectively suppressing laser light speckle.

6. When the three-color laser is projected onto the surface of the substrate with a microstructure, the spot contrast value of the projection screen before the film layer is not set is 11.78; while in the projection screen of the embodiment of the present invention, the spot contrast value is 11.78. 6.87%, showing that the effect of suppressing laser light speckle is better.

But what is described above is only a preferred embodiment of the present invention, and should not limit the scope of implementation of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention, All still belong to the scope covered by the patent of the present invention. In addition, any embodiment or scope of claims of the present invention does not need to achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the present invention. In addition, terms such as "first" and "second" mentioned in this specification or the scope of the patent application are only used to name elements (elements) or to distinguish different embodiments or ranges, and are not used to limit the number of elements. upper or lower limit.

10:Projection screen

100: Substrate

200: lower surface layer

210, 310, 410: Acrylic

220: Type I Particles

221: The first particle

222: second particle

230: Color paste or carbon black

300: intermediary layer

320: Type 2 Particles

321: The third particle

322: The fourth particle

323: fifth particle

400: upper surface layer

420: Type III Particles

421: The sixth particle

422: seventh particle

Claims (15)

A projection screen, comprising: a base material, a lower surface layer located on the base material, the material of the lower surface layer comprising an acrylic ester, color paste or carbon black, and a first-type particle; an intermediary layer located on the base material On the above, the material of the intermediary layer includes the acrylate and a second-type particle; and an upper surface layer is located on the substrate, and the material of the upper surface layer includes the acrylate and a third-type particle, wherein the lower surface layer, The intermediary layer and the upper surface layer are sequentially stacked on the substrate, the materials of the first-type particles, the second-type particles and the third-type particles do not overlap with each other, wherein the materials of the second-type particles include The porous material has the largest particle size among the materials included in the lower surface layer, the intermediate layer and the upper surface layer. The projection screen as claimed in item 1, wherein the first type particles include a first particle and a second particle, and the first particle and the second particle are silicone, polymethyl methacrylate, polymethyl Two of n-butylmethyl acrylate, polystyrene, silicon dioxide, calcium carbonate, hollow glass beads, aluminum oxide, potassium titanate, barium sulfate, titanium dioxide, porous ore, and zirconium oxide. The projection screen as claimed in item 2, wherein in the material of the lower surface layer, the density of the acrylate falls within the range of 45 to 60 g/cm ³ , and the density of the color paste or the carbon black falls between 0.3 and In the range of 1 g/cm ³ , the density of the first particles falls in the range of 6 to 15 g/cm ³ , and the density of the second particles falls in the range of 9 to 24 g/cm ³ . The projection screen as claimed in item 2, wherein in the material of the lower surface layer, the particle size of the color paste or the carbon black falls within the range of 0.02 to 0.1 micron, and the particle size of the first particle falls within 1 to 4 microns, and the particle size of the second particle falls within the range of 2 to 5 microns. The projection screen as claimed in item 2, wherein in the material of the lower surface layer, the refractive index of the acrylate falls within the range of 1.47 to 1.54, and the refractive index of the first particles falls within the range of 1.55 to 1.61, And the refractive index of the second particle falls within the range of 1.43 to 1.49. The projection screen as claimed in item 1, wherein the second type particles include a third particle, a fourth particle and a fifth particle, the third particle, the fourth particle and the fifth particle are silicone, Polymethyl methacrylate, poly-n-butyl methyl methacrylate, polystyrene, silica, calcium carbonate, hollow glass beads, alumina, potassium titanate, barium sulfate, titanium dioxide, porous minerals, zirconia and carbon Three of the black ones. The projection screen as claimed in item 6, wherein in the material of the intermediary layer, the density of the acrylate falls within the range of 50 to 58 g/cm ³ , and the density of the third particles falls within the range of 13 to 18 g/cm ³ In the range of , the density of the fourth particle falls in the range of 10 to 15 g/cm ³ , and the density of the fifth particle falls in the range of 4 to 9 g/cm ³ . The projection screen as claimed in item 6, wherein in the material of the intermediary layer, the particle size of the third particle falls within the range of 1 to 3 microns, and the particle size of the fourth particle The diameter of the fifth particle falls within the range of 5 to 9 microns, and the particle diameter of the fifth particle falls within the range of 8 to 12 microns. The projection screen as claimed in item 6, wherein in the material of the intermediary layer, the refractive index of the acrylate falls within the range of 1.47 to 1.54, and the refractive index of the third particle falls within the range of 1.54 to 1.60, The refractive index of the fourth particle falls within the range of 1.49 to 1.55, and the refractive index of the fifth particle falls within the range of 1.43 to 1.45. The projection screen as claimed in claim 6, wherein the fifth particle is the porous material and is the particle with the largest particle size. The projection screen as claimed in item 1, wherein the third-type particles include a sixth particle and a seventh particle, and the sixth particle and the seventh particle are silicone, polymethyl methacrylate, polymethyl Two of n-butylmethyl acrylate, polystyrene, silicon dioxide, calcium carbonate, hollow glass beads, alumina, potassium titanate, barium sulfate, titanium dioxide, porous ore, zirconia and carbon black. The projection screen as claimed in claim 11, wherein in the material of the upper surface layer, the density of the acrylate falls within the range of 55 to 65 g/cm ³ , and the density of the sixth particles falls within the range of 6 to 15 g/cm ³ range, and the density of the seventh particle falls within the range of 14 to 20 g/cm ³ . The projection screen as claimed in claim 11, wherein in the material of the upper surface layer, the particle size of the sixth particle falls in the range of 4 to 8 microns, and the particle size of the seventh particle falls in the range of 6 to 12 microns In the range. The projection screen as claimed in item 11, wherein in the material of the upper surface layer, the refractive index of the acrylate falls within the range of 1.51 to 1.60, and the sixth particle The refractive index falls within the range of 1.49 to 1.55, and the refractive index of the seventh particle falls within the range of 1.57 to 1.61. The projection screen as claimed in claim 1, wherein the substrate has a plurality of microstructures on the surface facing the lower surface layer.

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